From Wikipedia, the free encyclopedia

Canadian Forces Supplementary Reserve are
inactive or retired members of the Canadian Forces who are willing and
available for active service when requested.

The Supplementary Reserve (Supp Res) consists of 23,600 members
as of 1 April, 2009, some of which are unable to be contacted due
to outdated contact information. In an effort to meet the VCDS
intent for a more operationally focused Supp Res, members who do
not reply to Supp Res request(s) for written correspondence within
the given timeframe (minimum 30 days) or for whom a return to
sender letter is received from Canada Post will likely be released.
This release will be recorded as 5(c) – Service completed for which
required QR&O, Vol 1, Ch 15.01. The goal is to strengthen the
Supp Res and to provide a true representation to the Canadian
Forces of potentially available members for future employment.